Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IDEAS_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0/package.mo", uses=false) Using package IDEAS with version 3.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0/package.mo) Using package Modelica with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo) Using package Complex with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo) Using package ModelicaServices with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo) Running command: "" <> buildModelFMU(IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised,fileNamePrefix="IDEAS_IDEAS_Fluid_Examples_Performance_PressureDrop_SeriesFlowOptimised",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised,fileNamePrefix="IDEAS_IDEAS_Fluid_Examples_Performance_PressureDrop_SeriesFlowOptimised",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.007898/0.007898, allocations: 99.73 kB / 15.73 MB, free: 5.977 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.002017/0.002017, allocations: 197 kB / 16.68 MB, free: 5.906 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.472/1.472, allocations: 222.9 MB / 240.4 MB, free: 15.06 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IDEAS 3.0.0/package.mo): time 0.8776/0.8776, allocations: 132.2 MB / 422.7 MB, free: 6.559 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001977/0.001977, allocations: 68.22 kB / 0.5809 GB, free: 24.02 MB / 446.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1535/0.1555, allocations: 80.2 MB / 0.6592 GB, free: 10.75 MB / 0.4981 GB Notification: Performance of NFInst.instantiate(IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised): time 0.5441/0.6997, allocations: 161.6 MB / 0.817 GB, free: 9.945 MB / 0.5919 GB Notification: Performance of NFInst.instExpressions: time 0.003459/0.7032, allocations: 1.75 MB / 0.8187 GB, free: 8.969 MB / 0.5919 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.0004699/0.7037, allocations: 19.62 kB / 0.8188 GB, free: 8.957 MB / 0.5919 GB Notification: Performance of NFTyping.typeComponents: time 0.0006969/0.7044, allocations: 162.8 kB / 0.8189 GB, free: 8.852 MB / 0.5919 GB Notification: Performance of NFTyping.typeBindings: time 0.001588/0.706, allocations: 0.5233 MB / 0.8194 GB, free: 8.523 MB / 0.5919 GB Notification: Performance of NFTyping.typeClassSections: time 0.001335/0.7074, allocations: 393 kB / 0.8198 GB, free: 8.344 MB / 0.5919 GB Notification: Performance of NFFlatten.flatten: time 0.003015/0.7104, allocations: 2.526 MB / 0.8223 GB, free: 6.992 MB / 0.5919 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001485/0.7119, allocations: 0.9359 MB / 0.8232 GB, free: 6.461 MB / 0.5919 GB Notification: Performance of NFEvalConstants.evaluate: time 0.00217/0.7141, allocations: 1.033 MB / 0.8242 GB, free: 5.91 MB / 0.5919 GB Notification: Performance of NFSimplifyModel.simplify: time 0.00126/0.7154, allocations: 0.7057 MB / 0.8249 GB, free: 5.508 MB / 0.5919 GB Notification: Performance of NFPackage.collectConstants: time 0.0001787/0.7156, allocations: 59.2 kB / 0.8249 GB, free: 5.504 MB / 0.5919 GB Notification: Performance of NFFlatten.collectFunctions: time 0.001813/0.7174, allocations: 0.737 MB / 0.8257 GB, free: 5.109 MB / 0.5919 GB Notification: Performance of NFScalarize.scalarize: time 0.0004261/0.7179, allocations: 309.2 kB / 0.826 GB, free: 4.902 MB / 0.5919 GB Notification: Performance of NFVerifyModel.verify: time 0.0008291/0.7187, allocations: 0.5412 MB / 0.8265 GB, free: 4.574 MB / 0.5919 GB Notification: Performance of NFConvertDAE.convert: time 0.002105/0.7209, allocations: 1.419 MB / 0.8279 GB, free: 3.73 MB / 0.5919 GB Notification: Performance of FrontEnd - DAE generated: time 4.899e-06/0.7209, allocations: 0 / 0.8279 GB, free: 3.73 MB / 0.5919 GB Notification: Performance of FrontEnd: time 4.168e-06/0.7209, allocations: 0 / 0.8279 GB, free: 3.73 MB / 0.5919 GB Notification: Performance of Transformations before backend: time 2.753e-05/0.7209, allocations: 3.938 kB / 0.8279 GB, free: 3.727 MB / 0.5919 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 126 * Number of variables: 126 Notification: Performance of Generate backend data structure: time 0.002768/0.7237, allocations: 1.476 MB / 0.8293 GB, free: 2.582 MB / 0.5919 GB Notification: Performance of prepare preOptimizeDAE: time 4.628e-05/0.7238, allocations: 10.09 kB / 0.8293 GB, free: 2.582 MB / 0.5919 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.000161/0.7239, allocations: 102.7 kB / 0.8294 GB, free: 2.492 MB / 0.5919 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.000862/0.7248, allocations: 188.9 kB / 0.8296 GB, free: 2.402 MB / 0.5919 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001591/0.7264, allocations: 0.8545 MB / 0.8304 GB, free: 1.773 MB / 0.5919 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 4.821e-05/0.7265, allocations: 42.88 kB / 0.8305 GB, free: 1.758 MB / 0.5919 GB Notification: Performance of preOpt expandDerOperator (simulation): time 9.979e-05/0.7266, allocations: 61.78 kB / 0.8305 GB, free: 1.738 MB / 0.5919 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.00132/0.7279, allocations: 0.7896 MB / 0.8313 GB, free: 1.172 MB / 0.5919 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.259e-05/0.728, allocations: 11.38 kB / 0.8313 GB, free: 1.164 MB / 0.5919 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 5.223e-05/0.728, allocations: 17.44 kB / 0.8313 GB, free: 1.152 MB / 0.5919 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.229e-05/0.728, allocations: 15 kB / 0.8313 GB, free: 1.152 MB / 0.5919 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0009766/0.729, allocations: 0.5422 MB / 0.8319 GB, free: 0.8828 MB / 0.5919 GB Warning: The model contains alias variables with redundant start and/or conflicting nominal values. It is recommended to resolve the conflicts, because otherwise the system could be hard to solve. To print the conflicting alias sets and the chosen candidates please use -d=aliasConflicts. Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.005248/0.7343, allocations: 4.59 MB / 0.8364 GB, free: 12.57 MB / 0.6075 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0008007/0.7351, allocations: 416.5 kB / 0.8368 GB, free: 12.37 MB / 0.6075 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0003935/0.7355, allocations: 246.5 kB / 0.837 GB, free: 12.25 MB / 0.6075 GB Notification: Performance of preOpt evalFunc (simulation): time 0.000329/0.7359, allocations: 191.9 kB / 0.8372 GB, free: 12.05 MB / 0.6075 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0005515/0.7364, allocations: 287.7 kB / 0.8374 GB, free: 11.86 MB / 0.6075 GB Notification: Performance of pre-optimization done (n=31): time 2.675e-06/0.7365, allocations: 0 / 0.8374 GB, free: 11.86 MB / 0.6075 GB Notification: Performance of matching and sorting (n=31): time 0.001561/0.738, allocations: 0.6413 MB / 0.8381 GB, free: 11.54 MB / 0.6075 GB Notification: Performance of inlineWhenForInitialization (initialization): time 8.118e-05/0.7381, allocations: 82.39 kB / 0.8382 GB, free: 11.44 MB / 0.6075 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001553/0.7397, allocations: 1.116 MB / 0.8392 GB, free: 10.84 MB / 0.6075 GB Notification: Performance of collectPreVariables (initialization): time 9.86e-05/0.7398, allocations: 38.39 kB / 0.8393 GB, free: 10.8 MB / 0.6075 GB Notification: Performance of collectInitialEqns (initialization): time 0.0005124/0.7403, allocations: 499.4 kB / 0.8398 GB, free: 10.38 MB / 0.6075 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001417/0.7405, allocations: 110 kB / 0.8399 GB, free: 10.29 MB / 0.6075 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001823/0.7407, allocations: 122.5 kB / 0.84 GB, free: 10.21 MB / 0.6075 GB Notification: Performance of setup shared object (initialization): time 0.0001667/0.7409, allocations: 329.7 kB / 0.8403 GB, free: 9.895 MB / 0.6075 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0004327/0.7413, allocations: 216.2 kB / 0.8405 GB, free: 9.781 MB / 0.6075 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0006736/0.742, allocations: 0.5231 MB / 0.841 GB, free: 9.281 MB / 0.6075 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0009561/0.7429, allocations: 0.6279 MB / 0.8416 GB, free: 8.812 MB / 0.6075 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 8.055e-06/0.743, allocations: 3.406 kB / 0.8416 GB, free: 8.812 MB / 0.6075 GB Notification: Performance of matching and sorting (n=54) (initialization): time 0.001453/0.7444, allocations: 0.7352 MB / 0.8423 GB, free: 8.41 MB / 0.6075 GB Notification: Performance of prepare postOptimizeDAE: time 5.024e-05/0.7445, allocations: 33.58 kB / 0.8424 GB, free: 8.379 MB / 0.6075 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.136e-05/0.7445, allocations: 5.188 kB / 0.8424 GB, free: 8.379 MB / 0.6075 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.438e-05/0.7445, allocations: 10.16 kB / 0.8424 GB, free: 8.379 MB / 0.6075 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0004376/0.745, allocations: 109.7 kB / 0.8425 GB, free: 8.348 MB / 0.6075 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.333e-05/0.745, allocations: 7.812 kB / 0.8425 GB, free: 8.348 MB / 0.6075 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0007863/0.7458, allocations: 89.11 kB / 0.8426 GB, free: 8.289 MB / 0.6075 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.264e-05/0.7459, allocations: 24.81 kB / 0.8426 GB, free: 8.285 MB / 0.6075 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.0008071/0.7467, allocations: 0.4946 MB / 0.8431 GB, free: 7.996 MB / 0.6075 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0006026/0.7473, allocations: 491.9 kB / 0.8436 GB, free: 7.516 MB / 0.6075 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.0008471/0.7482, allocations: 0.5475 MB / 0.8441 GB, free: 7.09 MB / 0.6075 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 3.808e-06/0.7482, allocations: 2.406 kB / 0.8441 GB, free: 7.09 MB / 0.6075 GB Notification: Performance of matching and sorting (n=54) (initialization_lambda0): time 0.001256/0.7495, allocations: 0.6594 MB / 0.8447 GB, free: 6.727 MB / 0.6075 GB Notification: Performance of prepare postOptimizeDAE: time 4.193e-05/0.7495, allocations: 37.2 kB / 0.8448 GB, free: 6.695 MB / 0.6075 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 7.103e-06/0.7495, allocations: 5.031 kB / 0.8448 GB, free: 6.695 MB / 0.6075 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.233e-05/0.7495, allocations: 11.89 kB / 0.8448 GB, free: 6.691 MB / 0.6075 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003806/0.7499, allocations: 102.9 kB / 0.8449 GB, free: 6.664 MB / 0.6075 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.097e-05/0.75, allocations: 7.719 kB / 0.8449 GB, free: 6.664 MB / 0.6075 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0007962/0.7508, allocations: 68.64 kB / 0.845 GB, free: 6.629 MB / 0.6075 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.525e-05/0.7508, allocations: 21.81 kB / 0.845 GB, free: 6.625 MB / 0.6075 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 24 * Number of states: 0 () * Number of discrete variables: 5 (pulse_p.count,$PRE.pulse_p.count,pulse_p.T_start,$PRE.pulse_p.T_start,$whenCondition1) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (53): * Single equations (assignments): 52 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.0002468/0.7511, allocations: 224.3 kB / 0.8452 GB, free: 6.41 MB / 0.6075 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001812/0.7513, allocations: 106.5 kB / 0.8453 GB, free: 6.352 MB / 0.6075 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001081/0.7523, allocations: 494.7 kB / 0.8458 GB, free: 6.016 MB / 0.6075 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 7.614e-06/0.7524, allocations: 4 kB / 0.8458 GB, free: 6.012 MB / 0.6075 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 6.412e-06/0.7524, allocations: 4 kB / 0.8458 GB, free: 6.008 MB / 0.6075 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.013e-05/0.7524, allocations: 7.922 kB / 0.8458 GB, free: 6 MB / 0.6075 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.002374/0.7548, allocations: 1.387 MB / 0.8471 GB, free: 4.539 MB / 0.6075 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 4.678e-06/0.7548, allocations: 0 / 0.8471 GB, free: 4.539 MB / 0.6075 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0002755/0.7551, allocations: 63.89 kB / 0.8472 GB, free: 4.477 MB / 0.6075 GB Notification: Performance of postOpt tearingSystem (simulation): time 7.524e-06/0.7551, allocations: 4 kB / 0.8472 GB, free: 4.473 MB / 0.6075 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 2.7e-05/0.7551, allocations: 8 kB / 0.8472 GB, free: 4.465 MB / 0.6075 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 6.392e-06/0.7552, allocations: 4 kB / 0.8472 GB, free: 4.461 MB / 0.6075 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 7.374e-06/0.7552, allocations: 3.938 kB / 0.8472 GB, free: 4.457 MB / 0.6075 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001055/0.7562, allocations: 0.6071 MB / 0.8478 GB, free: 3.812 MB / 0.6075 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0003984/0.7566, allocations: 224.3 kB / 0.848 GB, free: 3.574 MB / 0.6075 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001378/0.7568, allocations: 11.98 kB / 0.848 GB, free: 3.562 MB / 0.6075 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0004165/0.7572, allocations: 23.86 kB / 0.8481 GB, free: 3.539 MB / 0.6075 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 9.482e-05/0.7573, allocations: 31.91 kB / 0.8481 GB, free: 3.508 MB / 0.6075 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.795e-05/0.7574, allocations: 15.98 kB / 0.8481 GB, free: 3.492 MB / 0.6075 GB Notification: Performance of sorting global known variables: time 0.001209/0.7586, allocations: 0.7836 MB / 0.8489 GB, free: 2.699 MB / 0.6075 GB Notification: Performance of sort global known variables: time 4.7e-07/0.7586, allocations: 4 kB / 0.8489 GB, free: 2.695 MB / 0.6075 GB Notification: Performance of remove unused functions: time 0.001449/0.76, allocations: 415.5 kB / 0.8493 GB, free: 2.289 MB / 0.6075 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 8 * Number of states: 0 () * Number of discrete variables: 3 ($whenCondition1,pulse_p.T_start,pulse_p.count) * Number of discrete states: 1 (pulse_p.count) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (31): * Single equations (assignments): 29 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 2 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.001818/0.7619, allocations: 1.226 MB / 0.8505 GB, free: 1.027 MB / 0.6075 GB Notification: Performance of simCode: created initialization part: time 0.001623/0.7635, allocations: 0.805 MB / 0.8513 GB, free: 204 kB / 0.6075 GB Notification: Performance of simCode: created event and clocks part: time 4.809e-06/0.7636, allocations: 0 / 0.8513 GB, free: 204 kB / 0.6075 GB Notification: Performance of simCode: created simulation system equations: time 0.0004462/0.764, allocations: 203.8 kB / 0.8515 GB, free: 0 / 0.6075 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002347/0.7664, allocations: 456.9 kB / 0.8519 GB, free: 15.57 MB / 0.6231 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.0138/0.7802, allocations: 8.181 MB / 0.8599 GB, free: 7.062 MB / 0.6231 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001026/0.7813, allocations: 1.176 MB / 0.861 GB, free: 5.855 MB / 0.6231 GB Notification: Performance of simCode: alias equations: time 0.001197/0.7825, allocations: 407.7 kB / 0.8614 GB, free: 5.453 MB / 0.6231 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0005963/0.7831, allocations: 327.3 kB / 0.8617 GB, free: 5.133 MB / 0.6231 GB Notification: Performance of SimCode: time 1.633e-06/0.7831, allocations: 4 kB / 0.8617 GB, free: 5.129 MB / 0.6231 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.06635/0.8495, allocations: 26.12 MB / 0.8872 GB, free: 11.33 MB / 0.6544 GB Notification: Performance of buildModelFMU: Generate platform static: time 10.27/11.12, allocations: 7.812 kB / 0.8872 GB, free: 11.33 MB / 0.6544 GB (rm -f IDEAS_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised.pipe ; mkfifo IDEAS_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised.pipe ; head -c 1048576 < IDEAS_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised.pipe >> ../files/IDEAS_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator --tempDir=temp_IDEAS_IDEAS_Fluid_Examples_Performance_PressureDrop_SeriesFlowOptimised_fmu --startTime=0 --stopTime=1 --timeout=50 --tolerance=1e-06 IDEAS_IDEAS_Fluid_Examples_Performance_PressureDrop_SeriesFlowOptimised.fmu > IDEAS_IDEAS.Fluid.Examples.Performance.PressureDrop.SeriesFlowOptimised.pipe 2>&1)